Improvement in valves and gearings for steam-engines



l. A. PRINCE.

Valves and Gearing for Steam-Engines.

Patented July 20,1875.

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proper times by the pressure ot' the steam JOHN A. PRINCE, or PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN VALVES AND GEARINGS FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 165,637, dated July 20, 1875; application led May 19,

To all whom t may concern:

Be it known that I, JOHN A. PRINCE, of Pittsburg, county oi' Allegheny and State ot' Pennsylvania, have invented a new and useful Improvement in Valves and Valve-Gearing of Steam, Pneumatic, and Hydraulic Engines, and I do hereby declare that the following is a full, clear, and exact description thereof, reference being' had to the accompanying drawings, making part of this specication, in which- Figure l is a vertical section of an enginecylinder, having two of my improved valves applied to it, said valves being arranged to be operated by my improved gearing, and the piston shown arranged to be guided from above. Fig. 2 is a vert-ical section, taken at right angles to the section' shown by Fig. l. In this view the piston is shown as arranged to be guided from below the cylinder. Figs. 3 and 4 are views of the upper and under faces of the valve-seat.

The nature of my invention consists in certain constructions and combinationsA ot' parts, as hereinafter described and specifically claimed, whereby the valve-seats and valves of an engine can be constructed within the cylinder, against the cylinder-heads, and each end of the cylinder be provided with receiving and exhausting passages, and the receiving-valves of said passages be opened at the upon the receiving-valves. at thc respective ends of the cylinder, and the simultaneous acting of sliding frames upon said valves; and whereby, also, the exhaust-valve at one end of the cylinder can be closed and the exhaust-valve at the other end opened simultaneously with the opening of a receiving-valve at one end of the cylinder, and the closing of a similar valve at the other end thereof.

In Fig. l of the drawings, A is the cylinder or" the engine, E E, its heads, and B B re ceiving and exhaust valve-seats, arranged within the cylinder against the heads. Each seat has a central receiving-passage, H or H1, and a series of exhaustpassages, I, and the inner faces of the cylinder-heads are made with channels or chambers f f, so as to allow the steam to flow into and out of the passages I. Thereceiving-passages H H1 are in communication with the receiving sides or channels HZ, and the exhaust-passages I I1 are in communication with the exhaust sides or channels I2. D D1 are the receiving-valves, which are very similar to puppet-valves, and are connected respectively to sliding frames G and F by means of stems D2. C G are the exhaustvalves, and J J rods for connecting these valves to the trames G and F. K and L are gum springs or cushions 011 the stems D2 and rods J Jf'of the valves C C and D D1, for compensating for any imperfection in construction and adjustment of one part with respect to another, and for difference in expansion of the frames and cylinder while the engine is in operation. M is the piston 'and N its rod.

Having reference to Fig. l of the drawing, the steam, air, or water is received through the passage H1 of the seat B', and enters the cylinder, as indicated by the arrow No. l in Fig. l. The entrance of the steam through this passage gradually moves the valve D1 trom its seat, and the piston M toward the upper end of the cylinder, and thereby causes the frameF to slide upward and gradually open the exhaust-valve C. The frame F then moves downward, closing valve D1 and eX- haust-valve C. The steam, next entering the upper passage H of seat B, opens the valve D and thereby causes the'frame G to open valve C', and thus the operation continues.

Having reference to Fig. 2, the operation is precisely the same as just described, except that the steam, air, or water first enters the passage H1, at the top of the cylinder, and causes the frame F, valves D1 and (l, and piston M to move downward.

It should be understood that the frames F and G hold the respective sets of valves to their seats at the different ends of the cylinder by means of suitable external mecha-11- isms. One proper arrangement is a rock-arm Worked by al1 eccentric or a cam, and another a direct connection of the frames with cams on the engine-shaft by cam-rods.

What claim sl 2. The combination of the frames F and G l. The oambiuzxtlon of the dnulrle tubular und vulves G wud D, substantially as mld fin* vulve-seat B', having' direct passages H and l the purpose described.

leading respectively to and from the interior JOHN A. PRINCE. of the cylinder, with the valve D and annular Vitnesses: vulve C, substantially as and for the purpose ARGHIE SHORE,

set forth. J As. MGFETRIGK. 

